Just noticed a bug and dont know how to fix it!

package com.benjamin.snapshot;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.widget.Toast;

import com.parse.ParseAnalytics;
import com.parse.ParseUser;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;


public class MainActivity extends ActionBarActivity implements ActionBar.TabListener {
        public static final String TAG = MainActivity.class.getSimpleName();

    public static final int TAKE_PHOTO_REQUEST = 0;
    public static final int TAKE_VIDEO_REQUEST = 1;
    public static final int PICK_PHOTO_REQUEST = 2;
    public static final int PICK_VIDEO_REQUEST = 3;

    public static final int MEDIA_TYPE_IAMGE = 4;
    public static final int MEDIA_TYPE_VIDEO = 5;

    protected Uri mMediaUri;
    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. We use a
     * {@link FragmentPagerAdapter} derivative, which will keep every
     * loaded fragment in memory. If this becomes too memory intensive, it
     * may be best to switch to a
     * {@link android.support.v4.app.FragmentStatePagerAdapter}.
     */
    SectionsPagerAdapter mSectionsPagerAdapter;
    protected DialogInterface.OnClickListener mDialogListener = new DialogInterface.OnClickListener(){
        @Override
        public void onClick(DialogInterface dialog, int which) {
            switch(which){
                case 0:
                    Intent takePhotoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    mMediaUri = getOutputMediaFileUri(MEDIA_TYPE_IAMGE);
                    if(mMediaUri == null){
                        //display error
                        Toast.makeText(MainActivity.this, R.string.SDCard_error, Toast.LENGTH_LONG).show();
                    } else {

                    }
                    takePhotoIntent.putExtra(MediaStore.EXTRA_OUTPUT, mMediaUri);
                    startActivityForResult(takePhotoIntent, TAKE_PHOTO_REQUEST);
                    break;
                case 1:
                    break;
                case 2:
                    break;
                case 3:
                    break;
            }
        }

        private Uri getOutputMediaFileUri(int mediaType) {
            if(isExternalStorageAvailable()){
                //get Uri
                //Get external storage directory
                File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                        MainActivity.this.getString(R.string.app_name));
                //Create subdirectory
                if (! mediaStorageDir.exists()){
                    if(! mediaStorageDir.mkdir()){
                        Log.e(TAG, "Failed to create directory");
                        return null;
                    }
                }
                //Create file name
                //Create file
                File mediaFile;
                Date now = new Date();
                String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(now);

                String path = mediaStorageDir.getPath() + File.separator;
                if (mediaType == MEDIA_TYPE_IAMGE){
                    mediaFile = new File(path + "IMG_" + timeStamp + ".jpg");
                } else if (mediaType == MEDIA_TYPE_VIDEO){
                    mediaFile = new File(path + "VID_" + timeStamp + ".mp4");
                } else {
                    return null;
                }

                Log.d(TAG, "File: " + Uri.fromFile(mediaFile));

                //Return file's Uri
                return Uri.fromFile(mediaFile);
            }else {
                return null;
            }
        }

        private boolean isExternalStorageAvailable(){
            String state = Environment.getExternalStorageState();

            if(state.equals(Environment.MEDIA_MOUNTED)){
                return true;

            } else{
                return false;

            }
        }
    };

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        supportRequestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.activity_main);

        ParseAnalytics.trackAppOpenedInBackground(getIntent());
        ParseUser currentUser = ParseUser.getCurrentUser();

        if (currentUser == null) {
            navigateToLogin();
        }
        else{
            Log.i(TAG, currentUser.getUsername());
        }

        // Set up the action bar.
        final ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        // When swiping between different sections, select the corresponding
        // tab. We can also use ActionBar.Tab#select() to do this if we have
        // a reference to the Tab.
        mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                actionBar.setSelectedNavigationItem(position);
            }
        });

        // For each of the sections in the app, add a tab to the action bar.
        for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
            // Create a tab with text corresponding to the page title defined by
            // the adapter. Also specify this Activity object, which implements
            // the TabListener interface, as the callback (listener) for when
            // this tab is selected.
            actionBar.addTab(
                    actionBar.newTab()
                            .setText(mSectionsPagerAdapter.getPageTitle(i))
                            .setTabListener(this));
        }
    }

    private void navigateToLogin() {
        Intent intent = new Intent(this, LoginActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
        startActivity(intent);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int itemId = item.getItemId();

        switch (itemId){
            case R.id.action_logout:
                ParseUser.logOut();
                navigateToLogin();
            case R.id.action_edit_friends:
                Intent intent = new Intent(this, EditFriendsActivity.class);
                startActivity(intent);
            case R.id.action_camera:
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setItems(R.array.camera_choices, mDialogListener);
                AlertDialog dialog = builder.create();
                dialog.show();
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
        // When the given tab is selected, switch to the corresponding page in
        // the ViewPager.
        mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

    @Override
    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

}